Permutation locks



March 6, 1962 s. STAHL ETAL PERMUTATION Locxs Filed Feb. 24, 1960 a Sheets-Shet i q I Amvmw Wendi HZIMZZ ATTORNZ'VAS'.

March 6, 1962 s. STAHL .ETAL 3,023,600

PERMUTATION LOCKS Filed Feb. 24, 1960 3 Sheets-Sheet 2 30 I j 1 VE TO 5 BY mmfmwz March 6, 1962 s. STAHL ETAL 3,023,500

PERMUTATION LOCKS Filed Feb. 24. 1960 3 Sheets-Sheet 3 United states harem Wauwatosa, Wis, assignors Wis, a corpora- This invention relates to improvements in permutation locks, and more particularly to a simplified permutation locker lock having an unusual locking mechanism of tumbler discs, bolt, lever, and locking slide within a case, resulting in a lock of the character described having a novel upsetting and self-locking mechanism, and a novel dial assembly.

Permutation locker locks are used on lockers and the like in schools, factories, and public buildings to store clothes, books, and personal belongings. The conventional permutation locker locks are generally quite complicated, and their internal parts, being formed of die cast materials, corrode and Wear easily from usage, resulting in frequent jamming and difiiculty in operation. In the present permutation locker lock the construction is simplified with all parts thereof being formed of hard wrought stamped or machined steel or brass parts, thereby providing a precision-built and sturdy locking mechanism which will function smoothly for years.

A specific object of the invention is to provide, in a permutation locker lock, lock mechanism housed in a formed rectangular no-seam case with one side rounded, and which includes a locking slide, lever, lever retaining bar, locking bolt, bolt support plate, springs, tumbler disc assemblies fastened onto a retaining or back plate and related parts, there also being a cover plate with pilot rings to hold all of the operating parts in position, whereby the lockcr lock is secured inside or within a locker door and covered by an escutcheon plate with concealed screws which fit previously punched holes in the door, the lock and escutcheon plate being fastened together by lock washers and nuts on said inaccessible screws. The escutcheon plate also serves to hold the new dial-knob assembly backed by a notched plate with a raised finger entering the disc driver plate to make an interlocking connection with the discs so that said discs may be rotated when the dialing knob on the outside of the locker is turned to dial the pre-selected combination, for movement and release of the locking bolt which is held under tension.

In some types of permutation locker locks it is possible for unauthorized persons to determine the combination after the locker is closed if the user has failed to turn the dial away from the last assigned number. This undesirable contingency can preferably be avoided by disturbing the dial before the locker door is closed. Therefore, the present invention, as another distinctive feature, incorporates a means of upsetting on the upstroke of the locker door latch handle, the discs and dial, to prevent unauthorized persons from seeing or noting the last number of the combination on the dial after the locker lift or latch bar is returned to a locked position, said operation being automatically accomplished by a mechanism which automatically upsets and disturbs all of the tumbler discs, thereby simultaneously moving the dial several numbers away from the last number of the pre-selected combination, as the lock is operated and the locking bolt is moved on the upstroke of the locker handle, depending upon the force used in opening the locker door.

When a permutation locker lock is on a locker door in a normal locked position, an unauthorized person or thief may try to gain entry by (a) exerting extra force or pressure in lifting up on the locker handle in an attempt to bend, break, or jam the internal lock parts so as to release the locking bolt, or (b) by continuous rotation of the dial of the lock he attempts to pick or feel out the correct combination to open the lock, or by chance pick the lock so that the lever falls into the tumbler disc gates or notches to release the locking bolt. With the foregoing in mind it is therefore another specific object of the in vention to provide a permutation locker lock wherein the internal parts within the lock case are so arranged, positioned and constructed, that their movements are inter-related, yet move in two different planes and directions, resulting in the locking parts, when in a normal locked position, remaining locked due to the rectangular projection of the locking slide which engages at right angles a recess in the lever retainer plate, thereby preventing or blocking the lever retainer plate, lever, and locking bolt from moving up vertically, when an unauthorized person exerts external forces or pressures on the locker handle trying to jam or open the look, without dialing.

A further object of the invention is to provide in an improved permutation locker lock a locking bolt arranged to reciprocate vertically while projecting exteriorly of the lock case, together with a lever having a mechanical movement devoid of spring tension in a direction opposite to the line of movement of the locking bolt, the lever being so arranged and positioned that it will not move by itself to fall into the gates or notches of the tumbler discs of the lock it by chance the correct combination is dialed by an unauthorized person rotating the dial, the knob being blocked from movement by serrations or teeth on a tumbler disc, whenever unusual force or pressure is exerted on the locker handle, all of which combine to provide an anti-picking device for the lever and lock.

Another specific object of the invention is to provide a permutation locker lock which is susceptible of easy as sembly and mounting on the door of a locker or the like.

A further object of the invention is to provide a permutation locker lock having operative internal parts which move under spring tension together with tumbler discs and a dialing knob which rotate in unison to manipulate the locking bolt of the mechanism to an open or closed position, operatively associated with the locking handle and latching bar mechanism of a standard metal locker.

A further object of the invention is to provide a permutation lock which is of relatively simple construction, which is strong and durable, which is easy to install and operate, and which is well adapted for the purposes described.

With the above and other objects in view, the invention consists of the improved permutation locker lock, and its parts and combinations as set forth in the claims, and all equivalents thereof.

In the accompanying drawings in which the same reference characters indicate the same parts in all of the views:

FIG. 1 is a fragmentary front view of a locker door equipped with the improved permutation lock to control the locker latch mechanism;

FIG. 2 is a vertical sectional view taken on line 2-2 of FIG. 1;

FIG. 3 is an enlarged vertical sectional view through a portion of a locker door and the improved permutation lock as installed therein;

FIG. 4 is a view taken approximately along the line 44 of PEG. 3, with parts broken away and showing the rear of the escutcheon plate;

PEG. 5 is a sectional View taken approximately along the line S5 of FIG. 3 showing the lock bolt in its normal locked position;

FIG. 6 is a sectional view similar to FIG. 5, only showing the position of the parts after the lock has been correctly dialed;

FIG. 7 is a similar sectional view only showing the lock released but with the tumbler discs upset;

FIG. 8 is a similar sectional view only showing the bolt moved downwardly with the tumbler discs upset, selflocking being accomplished;

FIG. 9 is a sectional view similar to FIG. 6 only showing the reversed lock mechanism for a locker door which opens oppositely to that shown in FIG. 1;

FIG. 10 is a face view, on a reduced scale, of the back retaining plate for the lock mechanism;

FIG. 11 is a reduced face view of the lock case cover plate;

FIG. 12 is an edge view of the lock case cover plate and associated door stop bumpers;

FIG. 13 is a detail view of a coiled spring used in the assemblage;

FIG. 14 is a plan view of one of the tumbler discs on a reduced scale; and

FIG. 15 is a face view of the locking slide on a reduced scale.

While the improved permutation lock is susceptible of broader application, by way of illustration it has been shown as installed in the hinged door of a locker 21 of the type used in schools, factories, public buildings, etc. The locker 21 and the latch mechanism for the door 20 is of standard construction so only certain features thereof will be briefiy described. Within the vertical margin "of the locker door 20 opposite the hinged margin thereof, there is mounted a vertically reciprocating latch bar 22 which is adapted to be raised and lowered to bring a shouldered slot 23 into and out of latching engagement with a latch dog 24 fixedly mounted on a frame portion of 'the locker adjacent the vertical margin of the locker door opening. Said latch dog carries resilient door stop bumpers 25. On the exterior of the locker door 20 adj acent the free vertical margin of the door there is mounted an operating handle 26 having tongue portions 27 integral therewith which extend through slots 28 in the face of the door 20 and are secured to the latching bar 22. Consequently, when the permutation lock which is applied to the locker door and which will be described hereinafter is unlocked, the handle 26 may be lifted vertically to raise the latching bar 22 and disengage the shouldered slot 23 from the latching dog 24, whereby the locker door is free to be swung to open position.

The improved permutation lock is indicated generally by the numeral 29 and it is mounted on a face of the locker door 20 adjacent the free vertical margin of the door, above the latching handle 26, as shown in FIGS. 1 and 2. Portions of the lock extend through an opening therefor in the locker door 20 and the lock casing 30 is actually adjacent the inner face of the door 20 and carries mechanism to be described hereinafter which controls the lock bolt 31 which projects through a slot 32 in the locker door latching bar 22 to block or permit vertical reciprocation of the locker door latching bar 22, according to the position of the lock bolt 31 relative to the upper or lower ends of the elongated slot 32, the lock bolt 31 being reciprocable vertically within said slot 32, all as will appear hereinafter.

The permutation lock 29 per se includes a knurled knob 33 which projects outwardly from the outer face of the locker door 20. Integral with the dialing knob 33 is a graduated dial 34, the periphery of which has an annular flange 35 and rotatably fits into an annular groove on in the outwardly ofiset head portion of an escutcheon plate 37. The latter is preferably shaped as shown in FIG. 4. Within the shell of the escutcheon plate 37 and covered by the decorative overlay of the escutcheon plate is a dial retaining plate 38 having a pair of upper and lower openings therein for the shank portions of securing bolts 39 whose heads are covered by the outer shell of the escutcheon plate 37, as shown in FIG. -3. This arrangement not only hides the heads of the screws but protects the same against tampering to deter unauthorized removal of the lock from the door 20. Between the outer face of the locker door 20 and the escutcheon plate 37 there is a metal ring 49 to prevent any undesired play or space when the lock is installed on the door and mounted in the manner shown. Integral pilot rings 41' (see FIG. 11) are formed around the bolt openings in the cover plate 73 and register with openings 41 drilled in the locker door 20 through which the shanks of the attaching bolts 39 extend.

Said raised pilot rings 41 (see FIG. 11) aid the alinement of the central axis of the knob assembly with the central axis of the lock assembly on the rear of the locker door 20 whereby the finger 46 (see FIG. 4) can easily enter and aline with its matching slot in the circular disc plate 47. Thus the clearance provided will be equally divided, for smooth operation, whenever the dial is turned through a complete revolution. Said raised pilot rings 41 also prevent any shifting of the lock while in use because they fit into apertures on the locker door. For instance, if any unusual upward or vertical pressure is exerted on the locker door handle 26 and is thus transmitted to the lock bolt, the lock is restrained against moving or shifting due to said raised pilot rings (and bolts) which hold the lock in place.

The numeral 42 (see FIGS. 3 and 4) designates a notched combination setting plate of a type well known in the permutation lock art and which can be arranged in a variety of circularly advanced positions so that a selected pair of diametrically opposed notches 43 therein will engage a pair of diametrically opposed semi-circular lugs 44 formed on the ring 45 surrounding the opening in the inner end of the knob 33. Also the notched plate 42, which has a central circular opening therein, has adjacent a marginal portion of said central opening an integral finger 46' at right angles to the plane of the plate 42 which is adapted to register with a slot therefor in the hub portion 47' of a circular disc driver plate 47.

It will thus be seen that manual rotation of the dial knob 33 is elfective, through the notched plate 42 carried fast thereby in a predetermined condition, to turn the circular disc driver plate 47 because the latter is positively engaged by the finger 46' on the notched plate.

Secured within the inner closed end portion of the lock casing 30 is a retaining back plate 48, shown in detail in FIG. 10, and to which is afiixed one end portion of a shouldered post 49 (see FIG. 3). Coaxially mounted for rotation on said post are a plurality of tumbler discs 50 of the type Well known in the permutation lock art and which are separated by Washers or spacers 51. Face portions of said tumbler discs 5%? also carry laterally protruding lugs 52 (see FIG. 14) engageable with portions of adjacent discs whereby all of the tumbler discs are interconnected to rotate with one another upon the turning of the dialing knob 33 to move the tumbler discs to certain predetermined positions when the preselected combination is dialed to open the lock. As is well known, when the discs have been properly turned, the notches 53 are all brought into a position of registration or coincidence, as in FIG. 6, for the purpose hereinafter to be set forth.

The front wall of the lock. casing 30 is provided with an elongated vertically extending slot 54 (see FIGS. 5 to 9 inclusive) in which there is vertically reciprocally mounted the locking bolt 31 previously mentioned, which lock bolt projects laterally of the front end of the lock .casing 30 but carries interiorly of the lock casing a pair of spaced apart transverse integral bars 56 and 57 providing a space therebetween with curved cam surfaces 58 being formed at the upper and lower ends of said space between the adjacent faces of the transverse bars 56 and 57. Vertically reciprocally mounted within the forward end of the lock casing 36 is a lever retaining bar 55 which has its inner vertical margin formed with a U-shaped recess 59 and which also has on a lower face portion a pin 6%) projecting at right angles to the plane of the lever retaining bar 55. The base portion of a Z-shaped tumbler disc lever 61 is pivotally mounted on said pin 60 and the free upper inner end portion or nose 61' of said tumbler disc lever is adapted, upon swinging movement of the lever 61, to enter the notches 53 of the tumbler discs when the lock combination has been properly manipulated, as shown in FIG. 6. The head portion 61 of said lever, in the locked condition of the assemblage, is adapted to enter into the space between the portions 56' and 57 of the bolt 31, as in FIGS. 5 and 8, but when the bolt 31 is reciprocated and tumbler disc notches 53 are accessible to the portion 61 of the tumbler disc lever, the riding of inclined portions of the lever 61 on a curved portion 58 of the bolt 31 will rock the lever 61 in a counter clockwise direction relative to FIGS. 5, 6, 7 and 8, as is best shown in FIGS. 6 and 7. Upward reciprocation of the lock bolt 31 is normally yieldingly restrained by a spring 62 whose intermediate coiled portion engages a post 63 projecting from an inner face portion of the retaining "back plate 48. Outer ends of the arms of the spring 62 bear respectively against an inner wall portion of the lock casing 3-0 and a top surface portion of the bolt bar 56.

From the description thus far given, it will be apparent that when the dialing knob 33 is manually turned to the correct, pre-selected combination, all of the turnbler discs 50 will have been turned so that their notches 53 are all in a position of coincidence adjacent the nose portion 61 of the tumbler disc lever 61, as is shown in FIG. 6. Then by lifting the locker door latch handle 26 upwardly which raises the latching bar 22 against the tension of a coiled spring 64, the lock bolt 31, because it is then engaged by the stock at the lower end of the slot 32, is raised, and during this lifting movement an angled portion of the tumbler disc lever 61 rides on the lower curved cam surface 53 formed on the portion 57 of the lock bolt 31, causing said tumbler disc lever 61 to pivot slightly in a counterclockwise direction relative to FIG. 6 and enter into and engage the registering notches 53 in the tumbler discs. Simultaneously, an inner portion of the nose 61 of said lever will engage the adjacent end portion of a reciprocatably mounted locking slide 65 (see FTG. which is housed below or inwardly of the retaining back plate 48 and which has a forward lug portion 65 which projects through a slot therefor in the front of the back retaining plate 48 and which is normally adapted to lodge in the U-shaped recess 59 in the lever retaining bar 55. Said locking slide 65 is normally yieldingly retained in its projected position by a coiled spring 66 which is housed within an opening 67 therefor in the plate 48 and which has one end carried by a protruberance 68 on the wall portion of said opening 67 and its otherend portion engages an outwardly struck flange 69 on the inner end of the locking slide 65. The midportion of said locking slide 65 is formed with an ovate opening 72 which accommodates the post 49 relative to which said slide may reciprocate.

As the locker handle 26 and the latching bar 22 are additionally raised over the position of FIG. 6, the lock bolt 31 and the lever retaining bar 55 and tumbler disc lever 61 also move upwardly additionally and compress the spring 62, as shown in FIG. 7. During this upward movement the nose portion 61' of the lever 61 remains for a short portion of its travel in engagement with the notches 53 of the tumbler discs and therefore advances the discs slightly to a point where the nose 61' of the lever 61 may slip out of said tumbler disc notches. With the locker door handle 26 raised, which disengages the notched portion of the locking bar 22. from the latch dog 24, the locker door may be readily opened. The opening action of the locker door, moving the tumbler discs from the correctly dialed position of FIG. 6 to the advanced position of FIG. 7, results in moving the visible and graduated dial 34 away from the last number of the assigned combination whereby it will be impossible for a person to then read the correct last number on the dial which was responsible for the opening of the lock.

The combined action of lowering the locker door handle 26 plus the expansive force of the spring 62 reciprocates the lock bolt 31 and the parts associated therewith downwardly so that the position of FIG. 8 then attains. As said bolt 31 moves downwardly under the force of the spring 32 the lower transverse bar portion 57 of the bolt will strike the shoulder 70 on the tumbler disc lever 63 and rock said lever to its straightened ventical position with its nose portion 61 clear of the notches in the tumbler discs. When the bolt 31 and lever retaining bar 55 reach their full down positions the spring 66 forces the locking slide 65 toward the right relative to FIG. 7 to again enter the portion 65' of the locking slide into the U-shaped recess 59 of the lever retaining bar 55 which automatically locks the lock so that all internal parts are returned to their normal locked positions, as shown in FIG. 5. If the locker door 20 is subsequently closed, it automatically latches and the lock is set in its locking condition so that it is unnecessary for the operator to turn the dial to effect complete locking.

The coiled spring 71 shown in FIGS. 3 and 13, being confined, bears against the circular disc driver plate 47 so as to maintain the parts, controlled by the knob 33 in proper engagement and registration.

In FIG. 9 there is shown the lock casing 30' reversed over that shown in the other views and which is adaptable to a locker door adapted to open in a direction opposite to that shown in FIGS. 1 and 2.

The side of the lock casing 30 which, in installed condition, is adjacent the locker door 20 is, in the normally closed condition covered by a lock case cover plate 73 shown in detail in FIG. 11 and also in FIG. 3. This cover plate has an eccentric shape to conform to the parts with which it is associated and has a central opening 74 surrounded by a collar 74 to receive the hub portion 47' of the circular disc driver plate 47. Said cover plate 73 has a snap fit over the front of the lock casing 30 and carries an inwardly projecting shouldered plate '75 whose plane is at right angles to the plane of the cover 73 and whose leg portions 75 straddle and confine portions of the mechanism within the look casing. Upper and lower portions of the cover plate 73 are also formed with bolt openings 41' to accommodate the attaching bolts 39.

The lock case 30 is formed in one piece with a rounded end portion to compactly house the internal mechanism including the locking bolt 3]., disc lever 61, lever retain ing bar 55, and locking slide 65, which are preferably formed of steel or brass and plated for rust-proofing to make the same long lasting. The pre-arranged notched plate 42 is turned by the knob 33 because of the finger 46 which connects with the circular disc driver plate 47 which, in turn, is connected with the tumbler discs whereby when the dialing knob is turned the tumbler discs are rotated. When the correct combination is dialed, the locking slide lever and bolt are released to unlock the door.

The improved permutation lock is designed so that it will thwart the effort of an unauthorized person or thief to gain entry into the locker by exerting undue force on the locker handle in an attempt to break or jam the internal lock parts to release the bolt, or by an attempt to pick or feel out the correct combination by continuous rotation of the lock dial. This is because the internal parts within the lock case are so arranged, positioned and constructed, that their movements, although inter-related, are in two diiferent planes and directions. The internal parts of the lock, in their normal locked position, cannot be unauthorizedly manipulated because of the rectilinear projection of the locking slide which engages at right angles the recess in the lever retaining plate, thereby preventing or blocking said lever retaining plate 55 and the tumbler disc lever and locking bolt from moving vertically upwardly should an unauthorized person exert unnecessary forces or pressure on the locker handle, trying to jam open the lock, without dialing. The disc lever 61 swings in a plane opposite to the line of movement of the lock bolt 31 and the lever :is so arranged and positioned that it will not move by itself nor fall into the notches of the tumbler discs if by chance the correct combination is dialed by an unauthorized person.

The foregoing may be best understood by referring to FIG. wherein the lock is in its normal locked condition. Should a thief exert undue pressure on the lock or handle, resistance to raising or moving the lock bolt 31 results from the bolt then trying to swing the lever 61 into the notches of the tumbler discs 50 whose notches are in an upset arrangement. Since the lever 61 cannot then rock into the disc notches 53, the pressure unauthorizedly applied to the locker handle 26 is transferred to a vertical force reacting upwardly against the bolt and lever 61. However, the lever transfers this attempted vertical movement to the lever retainer plate 55 through the pivot pin 60 but the lever retainer plate cannot move upwardly due to the re-ctilineal projection of the locking slide 65 into the recess 59 of the lever retainer plate which holds the latter firmly in place and maintains all parts in locked position, notwithstanding the undue force applied. The lever 61 is not under spring tension but is operated by a mechanical movement so, if by chance the correct combination should be dialed, there would be no automatic spring-urged snap imparted to the lever and the lever will not move into the disc recesses nor will the locking bolt move by itself.

Moreover, the outermost tumbler disc 50 shown in FIG. 14 has, because of the safety factor described, small notches or serrations 76 formed in its periphery. If unauthorized force is applied to turn the lever 61 into the normal notches 53 of the discs and said notches are in an upset position and not alined, the nose 61' of the lever 61 will instead drop into one of the peripheral serrations 76 of the outermost disc 50 and this will block or restrict further rotation of the dialing knob 33. This action will prevent the lock from being picked by feeling out the correct combination.

The improved permutation locker lock besides being of simple construction and easy to assemble, has the various safety factors previously indicated and is, additionally, self-locking when the locker door is closed and latched, and upsets the position of the last dialing graduation to prevent unauthorized detection. The lock is furthermore well adapted for the purposes described.

What is claimed as the invention is:

1. A combination lock comprising, a lock casing, a latching bar reciprocally mounted relative to the casing, a lock bolt reciprocally mounted in the casing and engaging the latching bar to control reciprocation of the latter, a post mounted within the casing, a plurality of notched tumbler discs coaxially mounted on the post for rotation thereon, a tumbler disc driver plate rotatably mounted on the post coaxially with said tumbler discs, the disc driver plate and tumbler discs being interconnected for joint turning movement, a manually operable knob extending externally of the casing and connected with the disc driver plate to turn the same, a lever retaining bar reciprocally mounted in the casing to move in a plane parallel to the plane of movement of the latching bar and transverse to the axis of the post, a lever pivotally mounted on said lever retaining bar and having a nose portion engageable and disengageable with the notches in the tumbler discs and engageable with the lock bolt to cause the latter to reciprocate with the lever retaining bar, and a locking slide yieldingly reciprocally mounted in the casing at right angles to the path of movement of the lever retaining bar and releasably engageable with the latter to block movemeat of the same when the lever is disengaged from the tumbler disc notches.

2. A combination lock comprising, a lock casing, a latching bar reciprocally mounted relative to the casing, a lock bolt reciprocally mounted through the casing and engaging the latching bar to control reciprocation of the latter, a post mounted within the casing, a plurality of notched tumbler discs coaxially mounted on the post for rotation thereon, a tumbler disc driver plate rotatably mounted on the post, the disc driver plate and tumbler discs being interconnected for joint turning movement, a manually operable knob extending externally of the casing, a combination setting plate adjustably fixed to said knob and connected with the disc driver plate to transmit turning movement from the knob to the tumbler discs, a lever retaining bar reciprocally mounted in the casing to move in a plane parallel to the plane of movement of the latching bar and transverse to the axis of the post, a lever pivotally mounted on said lever retaining bar and having a nose portion engageable and disengageable with the notches of the tumbler discs and also engageable with the bolt to transmit movement thereto, and a locking slide yieldingly reciprocally mounted in the casing at right angles to the path of movement of the lever retaining bar and releasably engageable with the latter.

3. A combination lock comprising, a lock casing, a latching bar reciprocally mounted exteriorly of the casing, a lock bolt reciprocally mounted through the casing for movement parallel to the latching bar and engaging the latter to control reciprocation thereof, a post mounted fast within the casing perpendicular to the line of movement of the bolt, a plurality of notched tumbler discs coaxially mounted on the post for rotation thereon, a tumbler disc driver plate rotatably mounted on the post coaxially with said tumbler discs, the disc driver plate and tumbler discs being interconnected for joint turning movement, a manually operable knob extending externally of the casing and connected with the disc driver plate to turn the same, a lever retaining bar reciprocally mounted in the casing to move in a plane parallel to the plane of movement of the latching bar and transverse to the axis of the post, a lever pivotally mounted on said lever retaining bar and having a nose portion engageable and disengageable With the notches in the tumbler discs and engageable with the lock bolt to cause the latter to reciprocate with the lever retaining bar, spring means yieldingly resisting joint movement in one direction of the bolt, the lever retaining bar and the lever, and a locking slide yieldingly reciprocally mounted in the casing at right angles to the path of movement of the lever retaining bar and releasably engageable with the latter to block movement of the same when the lever is disengaged from the tumbler disc notches.

4. A combination lock comprising, a lock casing, a latching bar reciprocally mounted exteriorly of the easi-ng, a lock bolt reciprocally mounted through the casing for movement parallel to the latching bar and engaging the latter to control reciprocation thereof, a plurality of superimposed notched tumbler discs rotatable within the casing on an axis perpendicular to the path of movement of the bolt, means for turning said discs to a predetermined position wherein their notches are in registration, a lever retaining bar reciprocally mounted in the casing to move in a plane parallel to the plane of movement of the latching bar, a lever pivotally mounted on said lever retaining bar and having a nose portion engageable and disengageable with the notches of the tumbler discs when they are in the predetermined position of registration, and also engageable with the bolt, and a locking slide yieldingly reciprocally mounted in the casing at right angles to the path of movement of the lever retaining bar and normally engaging the latter to prevent movement of the retaining bar and bolt, but being released when the lever nose swings to a tumbler disc notch engaging position.

5. A combination lock comprising, a lock casing, a

ing pivotal lever means engaging said bolt and moved by reciprocations thereof imparted by the latching bar to project into said tumbler disc notches when the same are in registration in a predetermined position.

6. A combination lock comprising, a lock casing, a door latching bar reciprocally mounted exteriorly of the casing, a unitary lock bolt reciprocally mounted through the casing for movement parallel to the latching bar and engaging the latter to control reciprocation thereof, a plurality of superimposed notched tumbler discs rotatable within the casing on an axis perpendicular to the path of movement of the bolt, means for turning said tumbler discs to a predetermined position wherein their notches are in registration, a lock bolt movement controlling assemblage operatively mounted within the casing and having pivotal means projectable into said tumbler disc notches when the same are in registration in a predetermined position whereby the lock bolt is free to reciprocate upon reciprocation of the door latching bar, and further having a portion engaging the lock bolt to reciprocate therewith, and locking means releasably engaging said reciprocal lock bolt engaging portion, said locking means being engaged, operated and controlled by pivotal movements of said pivotal means toward and away from its tumbler disc notch engaging position.

7. A combination lock comprising, a lock casing, a door latching bar reciprocally mounted exteriorly of the casing, a unitary lock bolt reciprocally mounted through the casing for movement parallel to the latching bar and engaging the latter to control reciprocation thereof, a plurality of superimposed notched tumbler discs rotatable within the casing on an axis perpendicular to the path of movement of the bolt, means for turning said tumbler discs to a predetermined position wherein their notches are in registration, an articulated lock bolt movement controlling assemblage operatively mounted within the casing and having a pivotal lever projectable into said tumbler disc notches when the same are in registration in a predetermined position whereby the lock bolt is free to reciprocate upon reciprocation of the door latching bar, a lever retaining bar engaging the lock bolt to reciprocate therewith and having said lever pivotally mounted thereon, means yieldingly restraining movement of said latte-r member in one direction, locking means releasably engaging said lever retaining bar, and means yieldingly urging said locking means toward its engaging position.

8. A combination lock comprising, a one-piece look casing, a door latching bar reciprocally mounted exteriorly of the casing, a lock bolt reciprocally mounted through the casing for movement parallel to the latching bar and engaging the latter to control reciprocation thereof, a plurality of superimposed notched tumbler discs rotatable within the casing on an axis perpendicular to the path of movement of the bolt, means extending exterior- 1y of the casing for manually turning said tumbler discs to a predetermined position wherein their notches are in registration, an articulated lock bolt movement controlling assemblage operatively mounted Within the casing and associated with the lock bolt and the tumber discs, said assemblage including a pivotal lever dog projectable into said tumbler disc notches when the same are in registration in a predetermined position whereby the lock bolt is free to reciprocateupon reciprocation of the door latching bar, a lever dog retaining bar engaging the lock bolt to reciprocate therewith and carrying said lever dog, yielding means restraining movement of said retaining bar in one direction, a locking slide extending at right angles to the line of movement of the retaining bar and releasably engaging said reciprocal retaining bar to prevent movement thereof, said locking slide being released by pivotal move ments of said pivotal lever dog, and a spring yieldingly restraining movement of said locking slide in one direction.

9. In a permutation lock including a slotted case and a bolt reciprocally projecting through said case slot, 21 plurality of co-axially mounted rotatable notched tumbler discs, and means interposed between said tumbler discs and the bolt for controlling reciprocation of the latter, comprising a bar within the case and reciprocable in a path parallel to the path of movement of the bolt, a yieldingly releasable slide engageable with said bar to block reciprocation thereof, and a nosed lever pivotably carried by said bar and swingable into a position to engage and release said slide when the tumbler discs have their notches alined with the nose of said lever and the same is pivotably moved to engage therein.

10. In a hingedly mounted door for an enclosure, the door carrying a reciprocable latching bar and a permutation lock casing thereadjacent, a lock bolt reciprocally mounted through the casing and having a locked position in engagement with said latching bar to prevent re ciprocation thereof, a plurality of rotatable co-axial tumbler discs within the lock casing, means extending exteriorly of the casing for manually turning said tumbler discs to a predetermined position wherein the notches are in registration, and a control assemblage within the easing including a reciprocating bar engaging said lock bolt to reciprocate therewith, a reciprocal, yieldingly mounted locking slide releasably engaging said reciprocating bar to block movement thereof, and a lever dog pivotally mounted on said reciprocating bar, said lever dog being projectable into said tumbler disc notches when the same are in registration in a predetermined position in which position said lever dog retracts the locking slide from the reciprocating bar permitting the latching bar to be moved in a rectilinear path to also move said lock bolt, the movement of the latter moving said reciprocating bar and the latch dog with the latter turning said tumbler discs beyond their predetermined positions to upset the same.

11. In a hingedly mounted door for an enclosure, the door carrying a reciprocable latching bar engageable and disengageable with a latch dog fixedly mounted on the enclosure and a permutation lock casing on the door adjacent the latching bar, a lock bolt reciprocally mounted through the casing and having a locked position in engagement with said latching bar to prevent reciprocation thereof and an unlocked position, a plurality of rotatable coaxial tumbler discs within the lock casing, a graduated dial and knob mounted on the door exteriorly of the casing for manually turning said tumbler discs according to a combination to a predetermined position wherein the notches are in registration, and a control assemblage within the casing including a yieldingly mounted reciprocating bar engaging said lock bolt to reciprocate therewith, a reciprocal, yieldingly mounted locking slide releasably engaging said reciprocating bar to block movement thereof, and a lever dog pivotally mounted on said reciprocating bar, said lever dog being projectable into said tumbler disc notches when the same are in registration in a predetermined dialed position in which position said lever dog retracts the locking slide from the reciprocating bar permitting the latching bar to be moved in a rectilinear path in one direction to also move said lock bolt to its unlocked position, the movement of the latter moving said reciprocating bar and the latch dog with the latter turning said tumbler discs beyond their predetermined positions to upset the same, a reverse movement of the latching bar automatically returning the lock bolt to its locked position.

12. A combination lock comprising, a lock casing, a latching bar reciprocally mounted exteriorly of the casing, a lock bolt reciprocally mounted through the casing for movement parallel to the latching bar and engaging the latter to control reciprocation thereof, a plurality of superimposed notched tumbler discs rotatable within the casing on an axis perpendicular to the path of movement of the bolt, one of said tumbler discs having a serrated periphery, graduated dial means for manually turning said discs to a predetermined position wherein their notches are in registration, a lever retaining bar reciprocally mounted in the casing to move in a plane parallel to the plane of movement of the latching bar, a lever dog pivotally mounted on said lever retaining bar and having a nose portion engageable and disengageable with the notches of the tumbler discs when they are in the predetermined position of registration, and also engageable with the bolt, and a locking slide yieldingly reciprocally mounted in the casing at right angles to the path of movement of the lever retaining bar and normally engaging the latter to prevent movement of the retaining bar and bolt, but being released when the lever nose swings to a tumbler disc notch engaging position, movement imparted to the lever dog through the lever retaining bar and lock bolt when force is applied to the latching bar when the tumbler discs are not in the predetermined position of notch registration, causing said lever dog to engage a peripheral serration on said tumbler disc to block unauthorized movement of said block mechanism.

13. In a door and permutation lock'assemblage which includes a reciprocable latching bar engageable and disengageable with a fixedly mounted latch dog, and a plurality of rotatable notched tumbler discs Within the .lock, the improvement which comprises: means between the reciprocable latching bar and the tumbler discs for simultaneously upsetting all of the latter upon reciprocation of the latching bar in a direction to disengage it from the latch dog but leaving the notches of all of the discs in mutual registration, said means including a reciprocable lock bolt movable into engagement with said latching bar to prevent reciprocation thereof, a reciprocable support bar engaging said lock bolt to reciprocate therewith, movable means releasably engageable with said reciprocable support bar to block movement thereof, and a lever dog pivotally supported on said support bar and controlling said movable means, said lever dog being projectable into said tumbler disc notches when the same are in registration in a predetermined position and also releasing said movable member from engagement with the support bar, movement of the latching bar in a rectilinear path carrying therewith said lock bolt and thereby moving said support bar and the latch dog thereon whereby the latch dog, in engagement with the notches on the tumbler discs, turns the same beyond their predetermined positions to upset the same.

References Cited in the file of this patent UNITED STATES PATENTS 1,902,214 Buettner et a1 Mar. 21, 1933 2,112,982 Brauning Apr. 5, 1938 2,357,305 Barrett Sept. 5, 1944 

